Comparative Analysis of UN and UO2 Oxidation in Air and Nitrogen Hemioxideстатья
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Дата последнего поиска статьи во внешних источниках: 10 апреля 2024 г.
Аннотация:Oxidation of UO2 and UN by atmospheric oxygen and nitrogen hemioxide, which is a hard-to-localizegreenhouse gas, was investigated by thermal analysis. For oxidation, mixtures of N2O–N2 and O2–N2 were used with a 20% volume fraction of the oxidizing agent. For UO2 and UN, the phase composition of the fi nal oxidation product in air and in N2O is the same―U3O8. In both cases, N2O behaves as a milder oxidizing agent compared to atmospheric oxygen. Oxidation of UO2 and UN in an N2O fl ow starts at a temperature 180 and 70°C higher than in air, respectively. The oxidation of UN in an N2O fl ow proceeds in three stages. At the fi rst stage, the reaction products are UO2 and U2N3; UO2 is the product of the second stage; and at the third stage U3O8 is produced. No pronounced staging is observed in the UO2 oxidation process. The possibility of utilizing nitrogen hemioxide when it is used in the course of voloxidation (oxidation) of spent nuclear fuel is shown.